Make toIntN & toUintN more accommodating

[Pisces] / numeric.js

diff --git a/numeric.js b/numeric.js
index 44c7cd5649772257f688cf5572236ce2452295e7..1d0a5435bb75512cd18b657759fdc6fccff85c89 100644 (file)
--- a/numeric.js
+++ b/numeric.js
@@ -605,15 +605,37 @@ export const {
   return {
     toIntN: (n, $) => {
       const prim = toPrimitive($);
-      const big·int = toBigInt(prim);
-      const intN = asIntN(n, big·int);
-      return typeof prim === "bigint" ? intN : toNumber(intN);
+      if (typeof prim === "bigint") {
+        // The primitive value is a big·int.
+        return asIntN(n, prim);
+      } else {
+        // The primitive value is not a big·int.
+        const int = trunc(prim);
+        if (!isFiniteNumber(int) || int == 0) {
+          // The truncated value is zero or not finite.
+          return 0;
+        } else {
+          // The truncated value is finite.
+          return toNumber(asIntN(n, toBigInt(int)));
+        }
+      }
     },
     toUintN: (n, $) => {
       const prim = toPrimitive($);
-      const big·int = toBigInt(prim);
-      const uintN = asUintN(n, big·int);
-      return typeof prim === "bigint" ? uintN : toNumber(uintN);
+      if (typeof prim === "bigint") {
+        // The primitive value is a big·int.
+        return asUintN(n, prim);
+      } else {
+        // The primitive value is not a big·int.
+        const int = trunc(prim);
+        if (!isFiniteNumber(int) || int == 0) {
+          // The truncated value is zero or not finite.
+          return 0;
+        } else {
+          // The truncated value is finite.
+          return toNumber(asUintN(n, toBigInt(int)));
+        }
+      }
     },
   };
 })();